Homework Answers
9. The following are equivakent to 2 mol/L:
a. 2 mol/ 1 L
b. 2 mol / 1000 ml
c. 5 mol / 2.5 L
The answer is a, b and c
10. in order to have 1 mol , Molarity * Volume in liters = 1
c. 500 ml of 2 m solution is the answer (0.5 * 2 = 1 mol)
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9. (four marks) Which of the following has a concentration of 2 mol/L? a. 2 mol/l...
4. (two marks) When diluting concentrated acids, always add a. a small acid volume to a...
4. (two marks) When diluting concentrated acids, always add a. a small acid volume to a larger volume of water b. a tiny volume of water to the acid c. a large acid volume to a small amount of water d. a 50-50 mixture of acid and water e. none of the above 5. (four marks) What volume of water should be added to 500 mL of a 1.0 mol/L CuSO4 solution to dilute it to 0.5 mol/L? a. 500...
please show work 17) When 200, mL of water are added to 100. mL of 12 % KCl solution the final concentration of KCI...
please show work
17) When 200, mL of water are added to 100. mL of 12 % KCl solution the final concentration of KCI is (Assume the volumes add.) A) 12% B) 4.0% C) 36%. D) 6.0% E) 8.0% 18) What is the molarity of a solution containing 5.0 moles of KCI in 2.0 L of solution? A) 2.5 M B) 1.0 M C) 5.0 M C) 10. M E) 2.0 M 19) What is the molarity of a solution...
Which of the following cannot be a buffer solution? Group of answer choices 1.0-L solution, in...
Which of the following cannot be a buffer solution? Group of answer choices 1.0-L solution, in which 0.10 mol acetic acid (CH3COOH) and 0.050 mol potassium hydroxide (KOH) are dissolved. 0.50-L solution, in which 0.25 mol ammonia (NH3) and 0.18 mol hydrochloric acid (HCl) are dissolved. 0.75-L solution, in which 1.0 mol hydrofluoric acid (HF) and 2.0 mol sodium hydroxide (NaOH) are dissolved. 1.0-L solution, in which 3.0 mol lithium hydroxide (LiOH) and 5.0 mol formic acid (HCOOH) are dissolved....
Exercise #1: (4 marks) Balance each of the following redox reactions in acid condition: a) Mg(s)...
Exercise #1: (4 marks) Balance each of the following redox reactions in acid condition: a) Mg(s) + H2O(g) → Mg(OH)2(s) + H2(8) b) Cr(NO3)3(aq) + Al(s) + Al(NO3)2(aq) + Cr(s) (6 marks) Exercise #2: In both cases write the balanced formula equation of the reaction and then answer to the question. a) If 25.98 mL of 0.1180 M KOH solution reacts with 52.50 mL of CH,COOH solution, what is the molarity of the acid solution? b) If 26.25 mL of...
10.1 Practice basic skills (grams, moles, g/mol, mol/L, dilution, stoichiometry): (a) Mow many grams of Br2...
10.1 Practice basic skills (grams, moles, g/mol, mol/L, dilution, stoichiometry): (a) Mow many grams of Br2 are produced when 1.50 g of FeBr; react with excess CI? 3 Cl2 + 2 FeBr + 3 Br2 + 2 FeCl3 (b) If the reaction in (a) happens in 500 mL of solution, what is the resulting molarity of CI? (c) Calculate the mL of concentrated H2SO4 (18 M) required to prepare 750 mL of 2.0 M solution.
help on questions 26-30 26. Which of the following concentration units will not change with temperature:...
help on questions 26-30
26. Which of the following concentration units will not change with temperature: molarity, percent mass, mole fraction, and molality. 27. Calculate the percent by mass of potassium nitrate in a solution made from 45.0 g KNO3 and 295 mL of water. The density of water is 0.997 g/mL. A) 1.51 % B) 7.57 % C) 13.3 % D) 15.2 % E) None of these 28. What is the molarity of a solution that is 5.50% by...
QUESTION 1 A solution of acid HA is prepared at four different concentrations: 2.0 mol L...
QUESTION 1 A solution of acid HA is prepared at four different concentrations: 2.0 mol L –1, 0.20 mol L –1, 0.020mol L –1, and 0.0020 mol L –1. Which of the four acid solutions will be least ionized? a. 0.0020 mol L–1 b. 2.0 mol L–1 c. 0.20 mol L–1 d. 0.020 mol L QUESTION 2. Which of the following best describes a buffer solution? a. The solution doesn’t change pH, even if large amounts of acid or base...
9. A buffer solution was prepared by mixing 12.0 mL of 0.12 mol L lactic acid...
9. A buffer solution was prepared by mixing 12.0 mL of 0.12 mol L lactic acid (HLac) with 18.0 mL of 0.16 mol L sodium lactate (NaLac). Kallactic acid) = 1.4 x104. (10 marks) a) Calculate the pH of the solution. Write all relevant chemical equations. State and verify any assumptions you make. 1/6] b) Two 200-ml buffer solutions were prepared with the same pH using different pairs of compounds, as outlined in the table below. Which of these two...
1. Apply the like dissoles lihe rule to predict which of the following liquids is immiscible...
1. Apply the like dissoles lihe rule to predict which of the following liquids is immiscible with liquid bromine, B a) chloroform, CHC1, e) water, H,o b) toluene, CJM.CH d) hesane, Call 2, what is the mass of a 1 2.5% blood plasma sample that contains 10.0 g of dissolved solute? a) 1.25 g What is the mass of solute dissolved in 10.0 g of a 5.00% sugar solution? a) 0.180 g b) 1.43 g c)70.0g d) 80.0 g 3,...
1) Which ONE of the following aqueous solutions contains the lowest concentration of cations, assuming 100%...
1) Which ONE of the following aqueous solutions contains the lowest concentration of cations, assuming 100% dissolution and ionization? (A) 0.5 M sodium phosphate (B) 1.0 M potassium nitrate (C) 2.0 M magnesium sulfate (D) 0.75 M calcium chloride (E) 1.5 M hydrogen chloride 2) The highest mass of SnS will dissolve in 1.0 L of an aqueous solution of: (A) 0.1 M MgS (B) 0.1 M (NH4)2S (C) 0.1 M Sn(NO3)2 (D) 0.1 M Na2S (E) 0.1 M CaCl2
4. (two marks) When diluting concentrated acids, always add a. a small acid volume to a larger volume of water b. a tiny volume of water to the acid c. a large acid volume to a small amount of water d. a 50-50 mixture of acid and water e. none of the above 5. (four marks) What volume of water should be added to 500 mL of a 1.0 mol/L CuSO4 solution to dilute it to 0.5 mol/L? a. 500...
please show work
17) When 200, mL of water are added to 100. mL of 12 % KCl solution the final concentration of KCI is (Assume the volumes add.) A) 12% B) 4.0% C) 36%. D) 6.0% E) 8.0% 18) What is the molarity of a solution containing 5.0 moles of KCI in 2.0 L of solution? A) 2.5 M B) 1.0 M C) 5.0 M C) 10. M E) 2.0 M 19) What is the molarity of a solution...
Exercise #1: (4 marks) Balance each of the following redox reactions in acid condition: a) Mg(s) + H2O(g) → Mg(OH)2(s) + H2(8) b) Cr(NO3)3(aq) + Al(s) + Al(NO3)2(aq) + Cr(s) (6 marks) Exercise #2: In both cases write the balanced formula equation of the reaction and then answer to the question. a) If 25.98 mL of 0.1180 M KOH solution reacts with 52.50 mL of CH,COOH solution, what is the molarity of the acid solution? b) If 26.25 mL of...
10.1 Practice basic skills (grams, moles, g/mol, mol/L, dilution, stoichiometry): (a) Mow many grams of Br2 are produced when 1.50 g of FeBr; react with excess CI? 3 Cl2 + 2 FeBr + 3 Br2 + 2 FeCl3 (b) If the reaction in (a) happens in 500 mL of solution, what is the resulting molarity of CI? (c) Calculate the mL of concentrated H2SO4 (18 M) required to prepare 750 mL of 2.0 M solution.
help on questions 26-30
26. Which of the following concentration units will not change with temperature: molarity, percent mass, mole fraction, and molality. 27. Calculate the percent by mass of potassium nitrate in a solution made from 45.0 g KNO3 and 295 mL of water. The density of water is 0.997 g/mL. A) 1.51 % B) 7.57 % C) 13.3 % D) 15.2 % E) None of these 28. What is the molarity of a solution that is 5.50% by...
9. A buffer solution was prepared by mixing 12.0 mL of 0.12 mol L lactic acid (HLac) with 18.0 mL of 0.16 mol L sodium lactate (NaLac). Kallactic acid) = 1.4 x104. (10 marks) a) Calculate the pH of the solution. Write all relevant chemical equations. State and verify any assumptions you make. 1/6] b) Two 200-ml buffer solutions were prepared with the same pH using different pairs of compounds, as outlined in the table below. Which of these two...
1. Apply the like dissoles lihe rule to predict which of the following liquids is immiscible with liquid bromine, B a) chloroform, CHC1, e) water, H,o b) toluene, CJM.CH d) hesane, Call 2, what is the mass of a 1 2.5% blood plasma sample that contains 10.0 g of dissolved solute? a) 1.25 g What is the mass of solute dissolved in 10.0 g of a 5.00% sugar solution? a) 0.180 g b) 1.43 g c)70.0g d) 80.0 g 3,...
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